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a×b=62,c×a=103,calculati valoarea expresiei a(b+c)+(c-b)×a×5

Răspuns :

ab+ac=62+103
a(b+c)=165
ac-ab=103-62
a(c-b)=41
a(b+c)+5a(c-b)=165+5x41=165+205=370